Method of winding coils



Dec. 31, 1929. P. sous IETHOD OF WINDING 001145 Filed Dec.

H is Attorhe y Patented Dec. 31, 1929 U Ni TED PIE'IRO BOLIS, OF'MILAN,ITALY, 'ASSIGNOR TO GENERAL ELECTRIC "COMPANY, A CORPORATION OF NEW YORKMETHOD 01E- WI-N DING COILS Application filed December27, 1927,' Seria1No.i 242,867, and in; Italy-December 28, 1926'.

My invention relates to a method andapparatus for winding coils forelectricrapparatus such as transformers and'inore particularly toainethod andapparatus for winding a stack of flat disc coils from asingle unbroken or continuous conductor and: with annular insulatingcollars interposed between adjacent coils of the stack. This type ofdisc coil stack has been used in the past to a large extent, successivecoils being wound on a suitable form and alternately from their insideto their outsideedges and from their outside to their inside edges toavoid the necessity of joints in the cross-over connections betweencoils. After winding each coil, a suitable flexible insulating collarhas'been-placed-next to it on thetorinf the collars being splitat oneside and spread open to permit them to be placed on the form. 'lhegeneral object of the present invention is to provide an'iniprovedmethod and apparatus-'whereby a stack of disc coils may be formedfrom-an unbroken or continuous conductor and'annular insulating collarsinterposed between adjacent coils without the necessity of splittingthese collars and thus reducing theireii ectiveness as insulatingbarriers between thecoils. V

The invention will be described inconnection with the accompanyingdrawing in which Fig. 1 is-a view of a portion o'f-ga disc coilstacliforined in accordance with the invention and a form of apparatuswhich may be used in forming the coil stack, Fig. 2 is aview'similar toFig. l but after one inorecoil has been formed in the stackyandFigsf 4:and 5 in dicate one method bywhich the coil *sta'ck may be'forined.

Like reference characters refer to similar parts in both figures of thedrawing. 7

i winding formed inaocor'dance with the invention, as indicated in thedrawing, coniprises a stack of disc coils with insulating collarsinterposed between adjacentcoils.

The coils areforrned in succession from'a continuousconductor 10 whichis fedonto acylinder 11, the cylinder being supported to rotate betweena'pair of centers 12 and 13 of a lathe. The first and alternate coils 14thereafter are wound: from their inner: to their outer edges andthesecond and alternate-coils 15 thereafteriare wound'from their outerto their inner'edges. Thus the cross-overs 16 which connectadjacentcoils are located alternately at the outer edges and at the inner edgesof the coils.

After each coil is formed, an annular insulating collar 17 is placednext to, it on the cylinder 11 so that adjacent coils areinsulated'froln each other. by these collars. It will be apparent and isobvious from the drawing that those cross-overs. 16 which are at theouter edges of the (1011514: and 15 pass over the outer edges of theirrespective collars 17 while those cross-overs which are at the inneredges of the coils 14 and 15 are close to the 171'are;placedsuccessiv-ely on the-:cylinder- 11 in suchrn anner thattheyalternately surround Y .andrdo not surround the conductor-10.

:Before-"startingwto form thelwinding, :all

the insulating collars 17 which are to be used 'between the coilslaand15: are supported around the lathe center at'the oppo'siteend of: thecylinder ll-froin that at which the winding is to be started,.thislathe'center being long enough to extend through all these collarsandsupport the cylinder. As shown the drawing, thewinding has beenstarted at the end' of the cylinder 11 which is nearest theftail center13 of the lathe so that all the insulating collars 'are supported aroundthe head or driving center 12 before the winding is stanted. Thecollars'17 are supported by two hooks 18 and: 19 in two groups 20 and 21at the same or'approxiniately llllQ'SZLDIlB num- "The conductor l0wh'ichis tO IEOIID the "winding is suppliedfrom a drum 'or reel 22.

The'end of the conductor 10 is withdrawn in the drawing, is wound fromits inner to its outer'edgeso that the first cross-over 16 'will passover the outer edge or outside of the 'first insulating collar 17. Thisfirst collar is therefore taken from the group 20 of collars on the hook18 and placed around the cylinder 11, being moved along the cylinder toa position close to the coil 14 which has just been wound. Insulatingcollars for this purpose .are generally made of flexible material suchas pressboard so that those from the group 20 may be easily bent enoughto permit them to be withdrawn through those in the group 21 and placedin position on the cylinder 11 without the necessity of splitting thecollars.

The next coil, which is the first coil 15, is next wound from its outerto its inner edge so that the second cross-over 16 will be close to thesurface of the cylinder 11 and must pass through the next insulatingcollar 17 as shown in the drawing. After this coil has been formed,therefore, a collar is taken from the group 21 of collars on the hook19, plated on the cylinder 11 and moved close to the coil 15 which hasjust been formed. It is apparent that this collar also may be placed inposition on the cylinder 11 without splitting the collar.

The steps which have been described are repeated until the winding hasbeen completed. The drawing shows the winding about half completed. InFig. 1, the last coil was wound from its inner to its outer edge and aninsulating collar 17 is shown as it is being transferred from the group20 through the group 21 to its position on the cylinder 11 close to thecoil just formed. Fig. 2 shows this insulating collar in place, the nextcoil wound from its outer to its inner edge, and the next insulatingcollar as it is being transferred from the group 21 to its position onthe cylinder 11. One method by which the coils 14 and 15 with theinterposed collars 17 may be formed is indicated in Figs. 3, 4 and 5.The coil stack or winding may be started, of course, from either end andformed in either direction, the method being exactly the same in eithercase. In Figs. 1 and 2, the winding is shown as being formed from theright end toward the left and in Figs. 3, 4 and 5, it is shown as beingformed from the left end toward the right. Each coil 14 is formed in theusual way by starting next to the cylinder 11 and winding one turn uponanother until the coil contains the desired number of turns. A collar 17from the group 20 is then moved along the cylinder 11 to a positionclose to the completed coil 14, the conductor passing outside the collarfrom the last or outer turn of the coil as shown in Fig. 3. Theconductor is then taken in close to the cylinder 11 and a temporary coil23 is next formed exactly like the coil 14, the turns progressing fromthe inside to the outside turn. The conductor is then taken in close tothe cylinder 11 again from the outer turn of the temporary coil 23 asshown in Fig. 4 and a coil 15 is formed by transferring the turns of thetemporary coil 23 to this new coil 15. Fig. 4 shows the condition aftertwo turns of the new coil 15 have been formed from the outer edge of thetemporary coil. The turns are wound loosely enough in the new coil 15 sothat after this coil hasbeen formed itmay be moved alongthe cylinder 11to its permanent position close to the collar 17 as shown in Fig. 5.This will leave an extra amount of conductor in the crossover 16. Thenew coil is then rotated through a small angle on the cylinder 11 totake up this extra conductor in the cross-over 16 and to tighten theturns in the coil 15, this being done by pulling on the conductor whereit leaves the inner turn of the new coil. A collar 17 from the group 21which surrounds the conductor 10 is then moved alongthe cylinder 11 to aposition close to the coil 15 as shown in Fig. 5. The coils 14 and 15are preferably spaced from the cylinder 11 by spacing strips 24 so thatthere is room for the conductor 10 between the cylinder 11 and the inneredge of the collar 17. The steps which have been described may now berepeated until the en tire winding has been completed.

The invention provides a convenient method and apparatus for forming acontinuous disc coil winding with integral insulating collars interposedbetween adjacent coils of the winding. While the invention has beendescribed in what is now believed to be its preferred embodiment, itwill be apparent that various changes may be made within the scope ofthe invention as defined in the appended claims.

hat I claim as new and desire to secure by Letters Patent of the UnitedStates is 1. A method of forming a continuous disc coil winding withintegral insulating collars interposed between adjacent coils, said method including passing a continuous conductor through part of said collarsto form the winding before said collars are assembled in the winding.

2. A method of forming a continuous disc coil winding with integralinsulating collars interposed between adjacent coils, said methodincluding passing a continuous conductor through one of two groups ofinsulating collars to form the winding, and assembling said collars inthe winding alternately from said two groups as said winding is formed.

3. A method of forming a continuous disc coil winding with integralinsulatingcollars interposed between adjacent coils, said meth odincluding passing a continuous conduct-or through one of two groups ofinsulating collars. forming a stack of disc coils from said. conductorby forming said coils with the con ductor extending alternately fromtheir in ner to their outer and from their outer to their inner edges,and assembling said collars in the winding alternately from said twogroups as said winding is formed.

4. A method of forming a continuous disc coil winding with integralinsulating collars hand this ninth day interposed between adjacentcoils, said method including passing a continuous conductor through oneof tWo groups of insulating collars, forming a stack of disc coils fromsaid conductor by forming said coils With the conductor extendingalternately from their inner to their outer and from their outer totheir inner edges, and assembling said collars in the Windingalternately from said two groups as said Winding is formed, the collarsfrom one of said groups being passed through the collars of the other ofsaid groups to their positions in the Winding.

5. Apparatus for forming a continuous disc coil Winding With insulatingcollars interposed between adjacent coils of the Winding, said apparatusincluding a pair of lathe centers to support a cylinder upon Which saidWinding may be formed, and means for supporting a plurality ofinsulating collars surrounding one of said lathe centers.

6. Apparatus for forming a continuous disc coil Winding With insulatingcollars interposed between adjacent coils of the Winding, said apparatusincluding a pair of lathe centers to support cylinder upon which saidwinding may be formed, and means for separately supporting tWo groups ofinsulating collars surrounding one of said lathe centers.

In Witness whereof, I have hereunto set my of December 1927.

Inc. PIETRO BOLIS.

